Balancing volumetric and gravimetric uptake in highly porous materials for clean energy
Balancing volumetric and gravimetric uptake in highly porous materials for clean energy
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DOI：
10.1126/science.aaz8881
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发表时间：
2020-04-17
期刊：
影响因子：
56.9
通讯作者：
Farha, Omar K.
中科院分区：
文献类型：
--
作者：
Chen, Zhijie;Li, Penghao;Farha, Omar K.
科学家面临的一个巨大挑战是开发具有超高孔隙率但保持重量和体积表面积之间平衡的吸附材料，用于船上存储氢气和甲烷气体（传统化石燃料的替代品）。在这里，我们报告了基于金属三核簇的超多孔金属有机框架（MOF）的模拟合成，即NU-1501-M（M = Al或Fe）。相对于其他超多孔MOF，NU-1501-Al同时表现出7310 m(2) g(-1)的高重量Brunauer-Emmett-Teller (BET)面积和2060 m(2) cm(-3)的体积BET面积，同时满足四个BET一致性标准。这种 MOF 的高孔隙率和表面积对氢气和甲烷产生了令人印象深刻的重量和体积存储性能：NU-1501-Al 超过了美国能源部的重量甲烷存储目标 (0.5 g g(-1))，在 100 bar/270 K 和 100 bar/270 K 下的吸收量为 0.66 g g(-1) [262 cm(3)（标准温度和压力，STP） cm(-3)]。 270 K 时 5 至 100 bar 工作能力为 0.60 g g(-1) [238 cm(3) (STP) cm(-3)]；它还显示出在组合温度和压力波动（77 K/100 bar -> 160 K/5 bar）下可输送的最佳氢气容量之一（14.0 重量%，46.2 g lit(-1)）。
A huge challenge facing scientists is the development of adsorbent materials that exhibit ultrahigh porosity but maintain balance between gravimetric and volumetric surface areas for the onboard storage of hydrogen and methane gas-alternatives to conventional fossil fuels. Here we report the simulation-motivated synthesis of ultraporous metal-organic frameworks (MOFs) based on metal trinuclear clusters, namely, NU-1501-M (M = Al or Fe). Relative to other ultraporous MOFs, NU-1501-Al exhibits concurrently a high gravimetric Brunauer-Emmett-Teller (BET) area of 7310 m(2) g(-1) and a volumetric BET area of 2060 m(2) cm(-3) while satisfying the four BET consistency criteria. The high porosity and surface area of this MOF yielded impressive gravimetric and volumetric storage performances for hydrogen and methane: NU-1501-Al surpasses the gravimetric methane storage U.S. Department of Energy target (0.5 g g(-1)) with an uptake of 0.66 g g(-1) [262 cm(3) (standard temperature and pressure, STP) cm(-3)] at 100 bar/270 K and a 5- to 100-bar working capacity of 0.60 g g(-1) [238 cm(3) (STP) cm(-3)] at 270 K; it also shows one of the best deliverable hydrogen capacities (14.0 weight %, 46.2 g liter(-1)) under a combined temperature and pressure swing (77 K/100 bar -> 160 K/5 bar).